The Seco Swiss-Style Copper Prism Assembly 6406-00 provides all the versatility and convenience surveying professionals appreciate. It has a copper-coated prism with a 62 millimeter diameter and -34 millimeter offset. This prism as well as a black and yellow removable target attach to the assembly's metal, water-resistant holder. The holder also features a front locking clamp and a GPH1 Swiss-Style thread on its base.